I'm not sure why this image was rejected for not meeting a technical requirement(s).
It's a 6.1MB jpeg picture, 5184x2920, 15.14 MP. No watermarks or timestamps.
I think one problem is the sharpness of the image. The sharp area is too small and the important part of the image, the eyes, are not in this focus area.
Next point is, the hairs on the blanket, I think, they should be removed.
To my eye there is no commercial value to this image. It is a nice family picture of a dog which is valuable for the owner. I do not see this as a sharp image. Don'g get into the trap of paralysis by analysis. Forget the rejection and try again to make a commercially viable image that tells a story or has something interesting for the viewer.
hairs on mat
Hairs on the mat wouldn't come under the technical reasons (I don't think). This is under white balance, contrast, over saturation, chromatic aberration... read this link...
Look at your white balance - it is a bit too red/warm, and contrast my be a bit too much as well.
I think the hairs on the mat are irrelevant.
Study the reasons for rejection, it is helpful!
Ah dogs left eye a close look shows there is garbage dropping out of it... once somewhere I read that claimed to be from an stock image agency reviewer that says they see many images of kids with garbage in eyes and the photographer even not notice what is dropping out of their nose, many even don't clean faces of kids before shooting photo and just upload. Their job is hectic they saw hundreds of similar images every day and many of them are some of us never want to see.
Many of mine images were also rejected Which I felt should have been approved for sale. But it is all on what adobe wants to sale. I don't know weather you edited the image before or not. as @ricky336 says just reduce the color temp and see if its color matches with actual color of your pet.
I just added it as my personal view what I feel after having a closer look.